<template>
  <div class="article-container">
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      title="黑马头条"
      @click-left="$router.back()" 
    ></van-nav-bar>

    <div class="main-wrap">
      <div v-if="loading" class="loading-wrap">
        <van-loading
          color="#3296fa"
          vertical
        >加载中</van-loading>
      </div>

      <div v-else-if="article.title" class="article-detail">
        <h1 class="article-title">{{article.title}}</h1>

        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            src="https://img.yzcdn.cn/vant/cat.jpeg"
          />
          <div slot="title" class="user-name">{{ article.aut_name }}</div>
          <div slot="label" class="publish-date">{{ article.pubdate | timeF }}</div>
        
          <follow-user 
            :autId="article.aut_id"
            v-model="article.is_followed"
          />
        </van-cell>

        <div 
          ref="contentBox"
          class="article-content markdown-body"
          v-html="article.content">
        </div>
        <van-divider>正文结束</van-divider>

        <comment-list 
          :list="commentList"
          :articleId="articleId"
          @getTotal="totalCount = $event"
          @clickReply2="showReplyFn"
        />

        <div class="article-bottom">
          <van-button
            class="comment-btn"
            type="default"
            round
            size="small"
            @click="isPostShow=!isPostShow"
          >写评论</van-button>
          <van-icon
            name="comment-o"
            :info="totalCount"
            color="#777"
          />
          <collect-article
            v-model="article.is_collected"
            :articleId="article.art_id"
          />
          <like-article 
            v-model="article.attitude" 
            :articleId="articleId"
          />
          <van-icon name="share" color="#777777"></van-icon>
        </div>
      </div>

      <div v-else-if="errStatus === 404" class="error-wrap">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>

      <div v-else class="error-wrap">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn" @click="getArticleByIdFn">点击重试</van-button>
      </div>
    </div>

    <van-popup
      v-model="isPostShow"
      position="bottom"
    >
      <comment-post 
        @submitSuccess="submitContent"
      />
    </van-popup>

    <van-popup
      v-model="isReplyShow"
      position="bottom"
      style="height: 100%"
    >
      <comment-replay 
        v-if="isReplyShow"
        :comment="comment"
        @closeReplay="isReplyShow=false"
      />
    </van-popup>
  </div>
</template>

<script>
import {getArticleById} from '@/api/article'
import '@/styles/content.less'
import { ImagePreview } from 'vant'
import FollowUser from '@/components/follow-user'
import CollectArticle from '@/components/collect-article'
import LikeArticle from '@/components/like-article'
import CommentList from './components/comment-list'
import CommentPost from './components/comment-post'
import CommentReplay from './components/comment-replay'

export default {
  name: 'ArticleIndex',
  props: {
    articleId: {
      type: [Number, String, Object],
      required: true
    }
  },
  data() {
    return {
      article: {},
      loading: true,
      errStatus: 0,
      isLoading: false,
      totalCount: 0,
      isPostShow: false,
      commentList: [],
      isReplyShow: false,
      comment: {}
    }
  },
  components: {
    FollowUser,
    CollectArticle,
    LikeArticle,
    CommentList,
    CommentPost,
    CommentReplay
  },
  created() {
    this.getArticleByIdFn()
  },
  methods: {
    async getArticleByIdFn() {
      try{ 
        const {data} = await getArticleById(this.articleId)

        let result = data.data
        result.content += '<img src="https://img12.360buyimg.com/n7/jfs/t1/194540/18/14371/518121/60f923d6E88654a1c/f6e07301c13c9df7.jpg"/><img src="https://img01.yzcdn.cn/vant/apple-2.jpg"/>'

        this.article = data.data
        this.loading = false

        setTimeout(() => {
          this.previewImg()
        })
       
      } catch(err) {
        if(err.response && err.response.status === 404) {
          this.errStatus = 404
        }
        this.loading = false
      }
    },
    previewImg() {
      let imgArr = this.$refs.contentBox.querySelectorAll('img')

      let images = []
      
      imgArr.forEach((img, index) => {
        images.push(img.src)

        img.onclick = function() {
          console.log(123)
          ImagePreview({
            images: images,
            startPosition: index,
            onClose () {
            }
          })
        }
      })
    },
    submitContent(info) {
      this.isPostShow = false

      this.commentList.unshift(info.data.new_obj)
    },
    showReplyFn(info) {
      this.isReplyShow = true
      this.comment = info
    }
  }
}
</script>

<style scoped lang="less">
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
